doman



Patented Nov. 8, I898.

A. E. DUMAN.

BRUSH HOLDER.

Application filed Feb. 4, 1898.)

2 Sheets-$heet I.

(No Model.)

INVENTOR BY /f /V%W,

ATTORNEYS WITNESSES:

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Patented Nov. 8, I898. A. E. DOMAN.

BRUSH HOLDER.

(Application filed Feb. 4, 1898) 2 Sheets-Sheet 2.

INVENTOR 444 9 BY Q/Wg NO. (N0 M U ITED STATES PATENT ()FFICE.

ALBERT E. DOMAN, OF ELBRIDGE, NEW YORK, ASSIGNOR TO THE ELBRIDGE ELECTRICAL MANUFACTURING COMPANY, OF SAME PLACE.

BRUSH-HOLDER.

SPECIFICATION forming part of Letters Patent No. 613,669, dated November 8, 1898.

Application filed February 4, 1898. Serial No. 669,116. 11105610 T0 ctZZ whom it may concern.-

Be it known that I, ALBERT E. DOMAN, of Elbridge, in the county of Onondaga and State of New York, have invented new and useful Improvements in Brush-Holders, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to improvements in brush-holders for use on dynamo-electric inachines, and has for its object the production of a device which is simple in construction, economical in manufacture, and causes the brush to make a positive and effective contact with the commutator, even though the periphery of said commutator is more or less irregular or uneven; and to this end it consists, essentially, in the combination, construction, and arrangement of the component parts of a brush-holder, as hereinafter fully described, and pointed out in the claims.

In describing this invention reference is had to the accompanying drawings, forming a part of this specification, in which likeletters indicate corresponding parts in all the views.

Figure 1 is an elevation, partly in section, of a pair of my improved brush-holders,shown as operatively mounted upon a rocker-arm. Fig. 2 is a plan view of one of said brushholders and a portion of its supporting spindle or pivot. Figs. 3 and 4 are plan views, partly in section, of the movable frame or support and the main portion of the brushclamp of one of my improvedbrush-holders.

A is a rocker-arm, and B B are a pair of my improved brush-holders mounted thereon. The rocker-arm A is of any desirable form, size, and construction, and is usually formed with oppositely-arranged arms a, provided with laterally-proj ecting spindles or pivots a. The brush-holdersB generally consist of movable frames or supports 1) and brush-clamps 1). Corresponding ends of the movableframes or supports 1) are mounted on the spindles or pivots a, being preferably formed with journal-openings b for receiving said spindles or pivots. The opposite ends of the frames or supports b are formed with sockets I), extending inwardly from their end faces and hav ing substantially concave faces, and are usually provided with apertures 1), opening outwardly from the sockets 19 through exterior faces of said framesor supports.

The brush-clamps b are formed with openings therein for receiving the brushes B and a ertures are movable in said a ertures to 6 a limited extent, and support suitable springs 0, usually interposed between shoulders or heads 6 formed upon the outer ends of said stems or arms, and Washers b engaged with the adj acentfaces of the frames or supports 1).

The springs 0 move the brush-clamps independently of the frames or supports Z) and hold said brush-clamps in their normal positions.

The brush-holders B are forced to their operative position by suitable springs D, en-

gaged with the frames or supports 19, and mounted upon suit-able supports d, which are preferably clamped to the spindles or pivots a by any desirable means, as screws d and nuts 61*. The supports (2 for the springs D are usually arranged in cut-outs 17 in the adjacent ends of the frames or supports b and are engaged by stop-faces b upon the frames or supports 1) as said frames or supports reach the limit of their movement. The supports d thus act as stops to limit the movement of the frames or supports 12.

My improved brush-holder is very simple in construction, is cheaply manufactured, and 0 permits a limited universal movement of the brush, thereby effecting a positive and thorough contact of the brush with the commutator. The construction and operation of my improved brush-holder will now be readily 5 understood upon reference to the foregoing description and the accompanying drawings, and it will be particularly noted that I do not herein limit myself to the exact construction and arrangement of the component parts of said brush-holder.

While I have shown my ball and-socket The projections b are preferably 60 joint with the socket on the supporting-arm and the ball member of the joint attached to the brush-clamp, it is obvious that said members may have the opposite arrangement, the ball being part of the supporting-arm and the socket attached to the brush-clamp, without departing from the nature and spirit of my invention.

Having thus fully described my invention, What I claim as new, and desire to secure by Letters Patent, is-

1. A brush-holder having a frame or support, combined with a brush-clamp secured thereto by a ball-and-socket joint.

2. In a brush-holder, the combination of a movable frame or support provided with a socket having a substantially concave face, and a brush-clam p provided with a projection having a substantially convex face for en gaging said substantially concave face, substan tially as and for the purpose specified.

3. In a brush-holder, the combination of a frame or support provided with a concave socket and abrush-clamp provided with a convex projection having a substantially universal movement in said socket, substantially as set forth.

4,. In a brush-holder, the combination of a frame or support provided with a concave socket and a brush-clamp formed with an opening therein for receiving the brush, and having one side provided with a clamping member and its opposite side provided with a projection movably mounted in said socket, substantially as set forth.

5. A brush-holder having a ball-and-socket joint connecting the frame to thebrush-clam p, one member of the said joint having an aperture, a rod or arm smaller than said aperture secured to the other member of said joint, and projecting through said aperture, and means on said rod for keeping said members in contact, substantially as set forth.

6. A. brush-holder having a ball-and-socket joint connecting the frame to the brush-clamp, one member of said joint having an aperture, a rod or arm smaller than said aperture secured to the other member of said joint and projecting through said aperture, and a spring secured to said rod or arm for holding said members together, substantially as set forth.

7. In a brush-holder, the combination of a movable frame or support provided with a socket having a substantially concave face, and with an aperture extending outwardly from the socket, a brush-clamp formed with an opening therein for receiving the brush, and having one side provided with a movable clamping member and its opposite side provided with a projection having a substantially convex face for engaging said substantially concave face and with a stem or arm extendin gthrough the aperture, and a spring mounted on the stem or arm for holding the brushclamp in its normal position, substantially as and for the purpose described.

8. In a brush-holder, the combination of a frame or support provided with a concave socket having an aperture, and a brush-clam p provided with a convex projection having a substantially universal movement in said socket, a rod or arm secured to said convex projection and fitting loosely in said aperture, a head on the free end of said rod or arm, and a spring interposed between said head and said concave socket for retarding the move ment of said joint, substantially as set forth. In testimony whereof I have hereunto signed my name, in the presence of two attesting witnesses, at Elbridge,in the county of Onondaga, in the State of New York, this 8th day of December, 1897.

ALBERT E. DOMAN. Witnesses:

F. J. Hitsmrrmn, AURILLA Wool). 

